Author Affiliations

Wei Liu,^1,2 Chen Li,³ Hsiang-Yu Chung,^1,2 Shih-Hsuan Chia,^1,2 Zhigang Zhang,³ Franz X. Kärtner,^1,2,4 and Guoqing Chang^1,4,*

¹Center for Free-Electron Laser Science, DESY, Notkestraße 85, 22607 Hamburg, Germany

²Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

³State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China

⁴The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany

^*Corresponding author: Guoqing.chang@desy.de